Toshiba GRL100-701B Instruction Manual page 47

tripping can be disabled by the scheme switches [Z1CNT] and [Z∗TP].
Note: For the symbols used in the scheme logic, see Appendix L.
Z1G
[PSB-Z1]
"ON"
Z1S
[PSB-Z1]
"ON"
Z2G
Z2G_BLOCK
1890
[PSB-Z2]
"ON"
Z2S
Z2S_BLOCK
1906
[PSB-Z2]
[Z2TP]
+
"ON"
"ON"
Z3G
Z3G_BLOCK
1891
[PSB-Z3]
"ON"
Z3S
Z3S_BLOCK
1907
[PSB-Z3]
[Z3TP]
+
"ON"
"ON"
ZRG
1894 ZRG_BLOCK
[PSB-ZR]
"ON"
ZRS
ZRS_BLOCK
1910
[PSB-ZR]
[ZRTP]
+
"ON"
"ON"
PSBG_DET
PSBS_DET
NON VTF
Figure 2.3.1.5 Scheme Logic of Time-stepped Distance Protection
Tripping by each zone can be blocked the PLC signal Z∗∗_BLOCK. The tripping can be also
blocked in the event of a failure of the secondary circuit of the voltage transformer or power
swing. The former is detected by the VT failure detection function. The signal VTF becomes 1
when a failure is detected. The latter is detected by the power swing blocking function. The signal
PSB becomes 1 when power swing is detected. The zone in which tripping will be blocked during
a power swing can be set using the selection switches [PSB-Z1] to [PSB-ZR]. For the VTF and
PSB, see Section 2.3.3 and Section 3.3.5, respectively.
By using the trip mode control logic, Zone 1 can implement different trip modes. The trip modes
as shown in Table 2.3.1.1 can be selected according to the position of the scheme switch [Z1CNT]
and whether or not the differential protection is in or out of service.
Phase
Trip
&
selection
mode
logic
control
circuit
&
TZ2G
t 0
&
0.00 - 10.00s
TZ2S
t 0
&
0.00 - 10.00s
TZ3G
t 0
&
0.00 - 10.00s
TZ3S
t 0
&
0.00 - 10.00s
TZRG
t 0
&
0.00 - 10.00s
TZRS
t 0
&
0.00 - 10.00s
 46 
6 F 2 S 0 8 5 0
TZ1G
t 0
S-TRIP
Sigle-phase
tripping
0.00 - 10.00s
command
TZ1S
t 0
M-TRIP
Three-phase
0.00 - 10.00s
tripping
≥ 1
command